This has also caused a major issue for us as well. For the past 3 years we have used Shopify POS the order number was the same as the receipt number. Suddenly it changed right during the busiest holiday of the year so that they no longer match. We sync our sales to Quickbooks Online and when the receipt number does not match, it takes twice as long to reconcile the deposits everyday. Now I have to have my store manager write the actual order number on every receipt before she turns in her daily deposit worksheet. Makes double work for everyone. And as you mentioned, Shopify did not let us know they were even doing this change.
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